What is a HashSet?

In this video I explain what HashSets and HashMaps are, and a little bit about their internals.
Having a basic understanding of these data structures is essential to understanding certain technical contraptions in Minecraft, such as 1.12 permaloaders and double tile tick scheduling (including the wireless redstone I showed last year).
A more in-depth video on the internals is still to come.

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Видео What is a HashSet? канала Earthcomputer